Jennifer Venditti took the photo of her son playing in the man-made lake outside the Disney's Grand Floridian Resort & Spa between 8 and 8:30 p.m. Tuesday, shortly before Lane Graves of Elkhorn, Nebraska was dragged into the water by a gator around 9:15 p.m.
Venditti wrote that helicopters were flying overhead until 1 a.m. early Wednesday and that she couldn't "help but wonder" if she and her son had come in contact with the Graves family prior to the incident.
"I can't imagine anyone could sleep knowing that the helicopter was searching for a missing child taken by an alligator," Venditti wrote on Facebook. "How does one go home without your baby in tow?"
Venditti wrote that "alligators were not on my mind at all when Channing was in the water," calling the beach "tiny" and "surrounded by pools, water slides, a restaurant and a fire pit."
"I can't conceive that an alligator would be in such a busy, small space," she wrote.
The Graves family had been enjoying the evening after watching a movie on the beach when a gator snatched the child, said Orange County Sheriff Jerry Demings in a press conference Wednesday afternoon. Matt Graves, the boy's father, tried to grab the child back from the gator, but was not successful, Demings said.
The boy's body was retrieved from the lake after 3 p.m. Wednesday.
The Graves family released a statement Thursday saying they were "devastated" at the loss of their son. They also thanked local Orlando authorities for working "tirelessly" to search for the toddler.
All of the beaches at Walt Disney World Resort remained closed, said Jacquee Wahler, Vice President, Walt Disney World Resort. Disney is conducting a "thorough review" of all of its processes and protocols, which includes the number, placement and wording of its signage and warnings, Wahler said.
A sign on the beach warned patrons not to swim in the lake but did not mention the possibility of gators in the water.
Disney Chairman and CEO Robert A. Iger called the family and said: "As a parent and a grandparent, my heart goes out to the Graves family during this time of devastating loss. My thoughts and prayers are with them, and I know everyone at Disney joins me in offering our deepest sympathies."
Disney is the parent company of ABC News.